cmake_modules/CompilerInfo.cmake

# Copyright 2013 Cloudera, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Sets COMPILER_FAMILY to 'clang' or 'gcc'
# Sets COMPILER_VERSION to the version
execute_process(COMMAND "${CMAKE_CXX_COMPILER}" -v
                ERROR_VARIABLE COMPILER_VERSION_FULL)
message(INFO " ${COMPILER_VERSION_FULL}")

# clang on Linux and Mac OS X before 10.9
if("${COMPILER_VERSION_FULL}" MATCHES ".*clang version.*")
  set(COMPILER_FAMILY "clang")
  string(REGEX REPLACE ".*clang version ([0-9]+\\.[0-9]+).*" "\\1"
    COMPILER_VERSION "${COMPILER_VERSION_FULL}")
# clang on Mac OS X 10.9 and later
elseif("${COMPILER_VERSION_FULL}" MATCHES ".*based on LLVM.*")
  set(COMPILER_FAMILY "clang")
  string(REGEX REPLACE ".*based on LLVM ([0-9]+\\.[0.9]+).*" "\\1"
    COMPILER_VERSION "${COMPILER_VERSION_FULL}")

# clang on Mac OS X, XCode 7.
elseif("${COMPILER_VERSION_FULL}" MATCHES ".*clang-700\\..*")
  set(COMPILER_FAMILY "clang")
  set(COMPILER_VERSION "3.7.0svn")

# gcc
elseif("${COMPILER_VERSION_FULL}" MATCHES ".*gcc version.*")
  set(COMPILER_FAMILY "gcc")
  string(REGEX REPLACE ".*gcc version ([0-9\\.]+).*" "\\1"
    COMPILER_VERSION "${COMPILER_VERSION_FULL}")
else()
  message(FATAL_ERROR "Unknown compiler. Version info:\n${COMPILER_VERSION_FULL}")
endif()
message("Selected compiler ${COMPILER_FAMILY} ${COMPILER_VERSION}")